1 x Double Separation Objective Lens for 90mm Refractive Astronomical Telescope - 500mm/650mm/1000mm Focal Length Options (D90F1000 Blue Film)

OPTICAL - Our 90mm dual separation lenses provide exceptional images with a combined image rating of 1/4-1/8, ensuring crisp, detailed astronomical observations. Versatile focal length options: Choose from different focal lengths (500mm, 650mm, 1000mm) to meet the needs of your telescope, enhancing your star-watching experience with flexibility in viewing distances. DURABLE MULTI LAYER COATING: Available with optional green or blue multi-layer coatings, these lenses minimize glare and maximize light transmission for brighter, sharper images. PRECISION ENGINEERING: Each lens is made with strict tolerances (diameter +0/-0.12mm, center thickness ±0.2mm) to ensure optimal performance and compatibility with various refractive telescopes. Easy Installation: Designed for DIY mounting, these lenses are perfect for telescope enthusiasts looking to upgrade or replace existing optics with add-ons.